222144021 has 18 divisors (see below), whose sum is σ = 352698710. Its totient is φ = 134632080.

The previous prime is 222144017. The next prime is 222144023. The reversal of 222144021 is 120441222.

222144021 is a `hidden beast` number, since 2 + 221 + 440 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 127373796 + 94770225 = 11286^2 + 9735^2 .

It is not a de Polignac number, because 222144021 - 2² = 222144017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222143985 and 222144003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222144023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 100906 + ... + 103083.

Almost surely, 2^222144021 is an apocalyptic number.

It is an amenable number.

222144021 is a deficient number, since it is larger than the sum of its proper divisors (130554689).

222144021 is a wasteful number, since it uses less digits than its factorization.

222144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204017 (or 204003 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 222144021 is about 14904.4966704683. The cubic root of 222144021 is about 605.6358054158.

Adding to 222144021 its reverse (120441222), we get a palindrome (342585243).

The spelling of 222144021 in words is "two hundred twenty-two million, one hundred forty-four thousand, twenty-one".